1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 43Get this manual
ENGINE SERVICING (TWI'N CYLINDER) 30, Assemble the coils in the coil bracketSecure the coils and coil bracket to the crankcase with two (2) lock washers and screws33Slide the axial fan shaft through the fan housing bearingsAssemble the inner pulley sheave, belt tension spacers, outer pulley sheave, and the lock washer on the axial fan shaftSecure the entire axial fan assembly in place with the lock washer and locknut
Slide cover down the spark plug lead wires and into the proper mounting positionNOTE: Spray spark plug lead wires with lubricant or silicone to facilitate sliding the coil coverSecure coil cover in position with the washer plate, two (2) lock washers and screws
Install the axial fan housing assembly to the crankcase, using the following procedure: A) Using two (2) flat washers, lock washers, and nuts, secure the intake side of the fan housing to the crankcase